wp cargo plugin

so i was using wp cargo for my shiping site and i discovered a problem that in the invoice of packages details i am not be able to enter the amount in decimal in the weight section for example :- like 1.25kg , 10.50kg, 0.25kg, it just gives an error that the values should be in numeric forms not in decimal forms. So i was asking that can we change that numeric only thing bca we really need that decimal exact weight of our packages. please look into that and send me a reply plz. HELP ME.